kfconcept
There are two types of FD mounts
FD/FL Breech-Mount (with a silver ring, you need to rotate the silver ring when attachment and removal), breech-lock mounts are identified by the silver ring
New-FD Bayonet Mount, bayonet mounts are identified by a red dot next to the lens release button
Here are the steps to install breech-mount version
Operating the adapter
A Mount Lens Adapter A-mount To E-mount Lens Adapter D Mount Lens Adapter E Mount Lens Adapter F Mount Lens Adapter L Mount Lens Adapter T Mount Lens Adapter X Mount Lens Adapter F-c Mount Lens Adapter Bronica Sq Pentax 67 Adapter
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